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HD6432351 데이터시트(PDF) 202 Page - Renesas Technology Corp

부품명 HD6432351
상세설명  16-Bit Single-Chip Microcomputer
PDF  1025 Pages
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제조업체  RENESAS [Renesas Technology Corp]
홈페이지  http://www.renesas.com
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HD6432351 데이터시트(HTML) 202 Page - Renesas Technology Corp

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Section 6 Bus Controller
Rev. 3.00 Sep 15, 2006 page 168 of 988
REJ09B0330-0300
6.5.9
Byte Access Control
When DRAM with a
×16 configuration is connected, the 2-CAS system can be used for the
control signals required for byte access.
When the CW2 bit is cleared to 0 in MCR, the 2-CAS system is selected. Figure 6.18 shows the
control timing in the 2-CAS system, and figure 6.19 shows an example 2-CAS system DRAM
connection.
When only DRAM with a
×8 configuration is connected, set the CW2 bit to 1 in MCR.
Tp
φ
CSn (RAS)
Byte control
A23 to A0
Tr
Tc1
Tc2
Row
CAS
LCAS
HWR (WE)
Column
Note: n = 2 to 5
Figure 6.18 2-CAS System Control Timing (Upper Byte Write Access)



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